树莓派 报IP 和 lcd显示IP

接 16x2 LCD

网上找的，就属这张图清晰了。

准备

由于我使用的是pidora, 所以很多库默认都没装（貌似是没wheezy方便，不过习惯了centos）

---

播放声音本想用mpc的，但安装完总有问题，于是就编译了一个 madplay

yum -y install alsa-utils alsa-lib-devel

至于TTS嘛，木有，就自己从网上下载了几段，然后拼起来播放。

for i in {0..255}; do wget -O $i.mp3 http://tts-api.com/tts.mp3?q=$i; done

实现代码

#!/usr/bin/env python
# encoding: utf-8

import Adafruit_CharLCD
import subprocess, time, datetime, math, signal, sys, os

def get_ip(device):
	ip = subprocess.check_output("ip -4 addr show " + device + " | grep inet | awk '{print $2}' | cut -d/ -f1", shell = True).strip()
	return ip

def main():
	last_ip = ip = ''
	maxLen = 16
	while True:
		ip = get_ip('eth0')
		if ip == last_ip:
			time.sleep(10)
			continue
		last_ip = ip
		sounds = ' /root/Music/tts/dot.mp3 '.join(['/root/Music/tts/' + i + '.mp3' for i in last_ip.split('.')]).split(' ')
		spaceLen = maxLen - len(ip)
		ip = int(math.floor(spaceLen / 2)) * ' ' + ip
		lcd.clear()
		lcd.message('  Raspberry Pi  \n')
		lcd.message(ip)
		subprocess.call(['madplay', '/root/Music/tts/your_ip_address_is.mp3'] + sounds)
		time.sleep(10)
		# + chr(0xdf) + 'C'
		# while True:
		# 	time.sleep(1)
		# 	lcd.clear()
		# 	lcd.message(datetime.datetime.now().strftime('  %I : %M : %S \n%a %b %d %Y'))

def onShutdown(sig, id):
	lcd.clear()
	time.sleep(.1)
	sys.exit(0)

if __name__ == '__main__':
	pid = os.fork()
	if pid == 0:
		signal.signal(signal.SIGTERM, onShutdown)
		lcd = Adafruit_CharLCD.Adafruit_CharLCD()
		main()
	else:
		sys.exit(0)